Since cpu retention dma use rc fast as clk source, so rc_fast_digi
will be enabled when we config to pd cpu. And cpu retention does not
need rc fast keep on during light sleep. So, if we use rc_fast_digi
to determine whether rc fast can be powered down, then cpu and and
rc fast cannot pd at the same time.
This component contains hardware-related operations for supporting the system. These operations
are one level above that of hal in that these(1) use system services such as memory allocation, logging, scheduling
or (2) may be multi-step operations involving/affecting multiple parts of the SoC.
Implementations that don't fit other components cleanly, but are not worth creating a new component for (yet) may also be placed here as long as they don't pull dependencies other than the core system components.
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